EP2693831B1 - Wireless communication method, sending device and receiving device - Google Patents

Wireless communication method, sending device and receiving device Download PDF

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Publication number
EP2693831B1
EP2693831B1 EP12765544.7A EP12765544A EP2693831B1 EP 2693831 B1 EP2693831 B1 EP 2693831B1 EP 12765544 A EP12765544 A EP 12765544A EP 2693831 B1 EP2693831 B1 EP 2693831B1
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European Patent Office
Prior art keywords
information
type
field carrying
frame
mac
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German (de)
English (en)
French (fr)
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EP2693831A1 (en
EP2693831A4 (en
Inventor
Dongshan Bao
Huijuan YAO
Yubao Zhou
Xiaoyan YU
Shenfa LIU
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Beijing Nufront Mobile Multimedia Technology Co Ltd
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Beijing Nufront Mobile Multimedia Technology Co Ltd
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Publication of EP2693831A4 publication Critical patent/EP2693831A4/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/604—Address structures or formats
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/618—Details of network addresses
    • H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • the present invention relates to the field of wireless communication, especially relates to a wireless communication method, a transmitting device and a receiving device.
  • the technical problem to be solved in the present invention is to provide a common MAC frame header with complete functions, which has a simple structure easy to realize and expand, and is specifically designed for and applicable to a newly defined mid-short distance wireless communication system.
  • a brief summary is given below to provide a basic understanding of some aspects of the embodiments disclosed. This section of summary is not to provide a general commentary, not to determine the key or important elements, and not to describe the protection scopes of these embodiments, but is merely to simply present some concepts, which act as a preamble of the subsequent detailed illustration.
  • the invention further provides a wireless communication method, which includes steps of: receiving one or more flows at a first layer, where each of the flows includes one or more packets; generating, at a second layer, one or more MAC protocol data units (MPDUs) according to one or more packets from the one or more flows, where the MPDU includes a MAC frame head, a frame body, and a frame check sequence (FCS), and the MAC frame head includes a frame control field, a fragment number field, a sequence number field, a reserved field, a fragment indication field and a length field; and generating a physical frame at a third layer to transmit an MPDU generated at the second layer.
  • MPDUs MAC protocol data units
  • FCS frame check sequence
  • the frame body is used to carry data to be transmitted or a payload from the contents of a management message.
  • the frame control field includes a protocol version, a frame type, a sub-type, a flow identifier, retransmission, power saving, and reservation.
  • the protocol version is used to indicate the current standard protocol version number.
  • the frame type is used to identify the function type of the frame, and includes a data type and a management type.
  • the sub-type is used to identify the function of each type of frame.
  • the flow identifier is used to identify a service connection of a terminal.
  • the retransmission is used to assist in removing repeated frames.
  • the power saving is used to a power saving mode of the STA.
  • the length field is used to represent the total bytes of all fields following the length field.
  • the fragment indication is used to indicate whether any subsequent fragment follows.
  • the fragment number is used to indicate the number of each fragment of the MSDU.
  • the sequence number is used to indicate the sequence number of the MSDU.
  • the present application provides a wireless communication method including: determining the type of a MAC frame header according to the type of an MPDU; assigning values to function fields in the MAC frame header, to generate the MAC frame header; generating the MPDU, which includes at least the MAC frame header; and encapsulating and then sending the MPDU.
  • the type of the MPDU indicates two types of frames having different MAC frame header lengths.
  • the Length L1 of a MAC frame header of a first one of the two types of frames and the Length L2 of a MAC frame header of a second one of the two types of frames are fixed, and the length L1 is smaller than the length L2.
  • the MAC frame header of the first one of the two types of frames is composed of a field carrying protocol version information, a field carrying frame type information, a field carrying sub-type information and a field carrying flow identification information, wherein, the protocol version information is used to indicate the current standard protocol version; the frame type information and the sub-type information are used to indicate the function type of the frame; the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains.
  • the MAC frame header of the first one of the two types of frames is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information and a field carrying repeat indication information, wherein, the protocol version information is used to indicate the current standard protocol version; the frame type information and the sub-type information are used to indicate the function type of the frame; the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains; the repeat indication information is used to indicate whether the current frame is a retransmission version of a previous frame.
  • the MAC frame header of the second one of the two types of frames is composed of a field carrying protocol version information, a field carrying frame type information, a field carrying sub-type information, a field carrying flow identification information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information
  • the protocol version information is used to indicate the current standard protocol version
  • the frame type information and the sub-type information are used to indicate the function type of the frame
  • the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains
  • the fragment number information is used to indicate a number of each fragment in the MSDU or MMPDU
  • the sequence number information is used to indicate a sequence number of the MSDU or MMPDU
  • the fragment indication information is used to indicate if any subsequent fragment of the current MSDU or MMPDU exists
  • the length information is used to indicate the total bytes of all fields between the MAC frame header field and the FCS field.
  • the MAC frame header of the second one of the two types of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information, a field carrying repeat indication information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information
  • the protocol version information is used to indicate the current standard protocol version
  • the frame type information and the sub-type information are used to indicate the function type of the frame
  • the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains
  • the repeat indication information is used to indicate whether the current frame is the retransmission version of a previous frame
  • the fragment number information is used to indicate the number of each fragment in the MSDU or MMPDU
  • the sequence number information is used to indicate the sequence number of the MSDU or MMPDU
  • the fragment indication information indicates if any subsequent fragment of the current MSDU or MMPDU exists
  • the length information is used to indicate
  • the method further includes determining the type of the MPDU according to the contents to be sent.
  • the method further includes filling the frame body of the MPDU with a payload according to the contents to be sent, wherein the MPDU at least includes the MAC frame header and the frame body, and the payload includes one or more MSDUs, or one MMPDU, or one MSDU fragment, or one MMPDU fragment.
  • the present application provides a wireless communication method including:
  • the type of the MPDU indicates two types of frames having different MAC frame header lengths.
  • the Length L1 of a MAC frame header of a first one of the two types of frames and the Length L2 of a MAC frame header of a second one of the two types of frames are fixed, and the length L1 is smaller than the length L2.
  • the MAC frame header of the first one of the two types of frames is composed of a field carrying protocol version information, a field carrying frame type information, a field carrying sub-type information and a field carrying flow identification information, wherein, the protocol version information is used to indicate the current standard protocol version; the frame type information and the sub-type information are used to indicate the function type of the frame; the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains.
  • the MAC frame header of the first one of the two types of frames is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information and a field carrying repeat indication information, wherein, the protocol version information is used to indicate the current standard protocol version; the frame type information and the sub-type information are used to indicate the function type of the frame; the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains; the repeat indication information is used to indicate whether the current frame is a retransmission version of a previous frame.
  • the MAC frame header of the second one of the two types of frames is composed of a field carrying protocol version information, a field carrying frame type information, a field carrying sub-type information, a field carrying flow identification information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information
  • the protocol version information is used to indicate the current standard protocol version
  • the frame type information and the sub-type information are used to indicate the function type of the frame
  • the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains
  • the fragment number information is used to indicate a number of each fragment in the MSDU or MMPDU
  • the sequence number information is used to indicate a sequence number of the MSDU or MMPDU
  • the fragment indication information is used to indicate if any subsequent fragment of the current MSDU or MMPDU exists
  • the length information is used to indicate the total bytes of all fields between the MAC frame header field and the FCS field.
  • the MAC frame header of the second one of the two types of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information, a field carrying repeat indication information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information
  • the protocol version information is used to indicate the current standard protocol version
  • the frame type information and the sub-type information are used to indicate the function type of the frame
  • the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains
  • the repeat indication information is used to indicate whether the current frame is the retransmission of a previous frame
  • the fragment number information is used to indicate the number of each fragment in the MSDU or MMPDU
  • the sequence number information is used to indicate the sequence number of the MSDU or MMPDU
  • the fragment indication information indicates if any subsequent fragment of the current MSDU or MMPDU exists
  • the length information is used to indicate the
  • the MPDU further comprises a frame body
  • the method further comprises: parsing the frame body and extracting a payload from the frame body, wherein the payload includes one or more MSDUs, or one MMPDU, or one MSDU fragment, or one MMPDU fragment.
  • a transmitting device including:
  • the type of the MPDU indicates two types of frames having different MAC frame header lengths.
  • the Length L1 of a MAC frame header of a first one of the two types of frames and the Length L2 of a MAC frame header of a second one of the two types of frames are fixed, and the length L1 is smaller than the length L2.
  • the MAC frame header of the first one of the two types of frames is composed of a field carrying protocol version information, a field carrying frame type information, a field carrying sub-type information and a field carrying flow identification information, wherein, the protocol version information is used to indicate the current standard protocol version; the frame type information and the sub-type information are used to indicate the function type of the frame; the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains.
  • the MAC frame header of the first one of the two types of frames is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information and a field carrying repeat indication information, wherein, the protocol version information is used to indicate the current standard protocol version; the frame type information and the sub-type information are used to indicate the function type of the frame; the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains; the repeat indication information is used to indicate whether the current frame is a retransmission of a previous frame.
  • the MAC frame header of the second one of the two types of frames is composed of a field carrying protocol version information, a field carrying frame type information, a field carrying sub-type information, a field carrying flow identification information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information
  • the protocol version information is used to indicate the current standard protocol version
  • the frame type information and the sub-type information are used to indicate the function type of the frame
  • the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains
  • the fragment number information is used to indicate a number of each fragment in the MSDU or MMPDU
  • the sequence number information is used to indicate a sequence number of the MSDU or MMPDU
  • the fragment indication information is used to indicate if any subsequent fragment of the current MSDU or MMPDU exists
  • the length information is used to indicate the total bytes of all fields between the MAC frame header field and the FCS field.
  • the MAC frame header of the second one of the two types of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information, a field carrying repeat indication information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information
  • the protocol version information is used to indicate the current standard protocol version
  • the frame type information and the sub-type information are used to indicate the function type of the frame
  • the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains
  • the repeat indication information is used to indicate whether the current frame is the retransmission of a previous frame
  • the fragment number information is used to indicate the number of each fragment in the MSDU or MMPDU
  • the sequence number information is used to indicate the sequence number of the MSDU or MMPDU
  • the fragment indication information indicates if any subsequent fragment of the current MSDU or MMPDU exists
  • the length information is used to indicate the
  • the determination module is further used to determine the type of the MPDU according to the contents to be sent.
  • the second generation module is further used to fill the frame body of the MPDU with a payload according to the contents to be sent
  • the MPDU at least includes the MAC frame header and the frame body
  • the payload includes one or more MSDUs, or one MMPDU, or one MSDU fragment, or one MMPDU fragment.
  • the present application provides a receiving device including:
  • the type of the MPDU indicates two types of frames having different MAC frame header lengths.
  • the Length L1 of a MAC frame header of a first one of the two types of frames and the Length L2 of a MAC frame header of a second one of the two types of frames are fixed, and the length L1 is smaller than the length L2.
  • the MAC frame header of the first one of the two types of frames is composed of a field carrying protocol version information, a field carrying frame type information, a field carrying sub-type information and a field carrying flow identification information, wherein, the protocol version information is used to indicate the current standard protocol version; the frame type information and the sub-type information are used to indicate the function type of the frame; the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains.
  • the MAC frame header of the first one of the two types of frames is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information and a field carrying repeat indication information, wherein, the protocol version information is used to indicate the current standard protocol version; the frame type information and the sub-type information are used to indicate the function type of the frame; the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains; the repeat indication information is used to indicate whether the current frame is a retransmission of a previous frame.
  • the MAC frame header of the second one of the two types of frames is composed of a field carrying protocol version information, a field carrying frame type information, a field carrying sub-type information, a field carrying flow identification information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information
  • the protocol version information is used to indicate the current standard protocol version
  • the frame type information and the sub-type information are used to indicate the function type of the frame
  • the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains
  • the fragment number information is used to indicate a number of each fragment in the MSDU or MMPDU
  • the sequence number information is used to indicate a sequence number of the MSDU or MMPDU
  • the fragment indication information is used to indicate if any subsequent fragment of the current MSDU or MMPDU exists
  • the length information is used to indicate the total bytes of all fields between the MAC frame header field and the FCS field.
  • the MAC frame header of the second one of the two types of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information, a field carrying repeat indication information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information
  • the protocol version information is used to indicate the current standard protocol version
  • the frame type information and the sub-type information are used to indicate the function type of the frame
  • the flow identification information is used to indicate a specific uplink or downlink service flow to which the current frame pertains
  • the repeat indication information is used to indicate whether the current frame is the retransmission version of a previous frame
  • the fragment number information is used to indicate the number of each fragment in the MSDU or MMPDU
  • the sequence number information is used to indicate the sequence number of the MSDU or MMPDU
  • the fragment indication information indicates if any subsequent fragment of the current MSDU or MMPDU exists
  • the length information is used to indicate
  • the MPDU also includes a frame body
  • the parsing module is further used to parse the frame body and extract a payload from the frame body, wherein the payload includes one or more MSDUs, or one MMPDU, or one MSDU fragment, or one MMPDU fragment.
  • a common MAC of MPDU frame header is designed to obtain a signaling format, which has complete functions and a simple structure and is easy to realize and expand, the signaling format, is applicable to a newly defined mid-short distance wireless communication system, reduces the processing complexity. As a result, the processing is simple and stable, the parse is convenient, it is not demanding for the system performance, and the system overhead is reduced, thus realizing the efficient transmission of the service and improving the utilization rate of the air interface resources.
  • one or more embodiments include the features that will be illustrated in detail below and specifically recited in the claims.
  • the following illustration and drawings illustrate some exemplary aspects in detail; moreover, it only indicates some of the various modes in which the principle of each embodiment may be applied.
  • Other benefits and novel features will be apparent from the following detailed illustration in conjunction with the drawings, and all the embodiments disclosed intend to contemplate all these aspects and their equivalents.
  • MAC refers to Media Access Control
  • PDU MAC Protocol Data Unit
  • MPDU a data unit exchanged between two peer MAC entities using PHY layer services.
  • MPDU Management Protocol Data Unit
  • MMPDU a data unit exchanged between two peer MAC entities to realize MAC management protocol
  • SDU MAC Service Data Unit
  • MSDU the information delivered as units between MAC Service Access Points (SAPs);
  • PHY refers to a Physical layer;
  • PDU refers to a Protocol Data Unit;
  • CAP Central Access Point
  • STA Station (STA): a terminal device containing MAC and PHY functional interfaces and able to communicate with a CAP;
  • FID refers to a Flow identifier (i.e.
  • FCS refers to a Frame Check Sequence
  • MIMO refers to Multiple Input Multiple Output
  • OFDM refers to Orthogonal Frequency Division Multiplexing
  • QoS refers to Quality of service
  • ARQ refers to an Automatic Repeat Request.
  • the first embodiment of the present invention provides a newly defined mid-short distance wireless communication system.
  • a MAC layer includes an adaptation sub-layer and a MAC sub-layer.
  • the adaptation sub-layer takes a function of mapping and transforming between external network data and MAC Service Data Unit (MSDU).
  • MSDU MAC Service Data Unit
  • the MAC sub-layer not only takes a media access control function, also manages and controls the system as well as supports specific functions of the PHY layer.
  • the PHY layer mainly provides a PHY transmission mechanism for mapping MAC layer protocol data units (MPDUs) to the corresponding physical channel, and adopts OFDM and MIMO technologies.
  • MPDUs MAC layer protocol data units
  • the MAC layer is the middle layer located between an upper layer and the PHY layer for receiving and sending, and is used to manage and control the distribution and sharing of transmission resources at the physical layer among multiple users.
  • an efficient MAC protocol needs to be designed. Therefore, the present invention mainly relates to the MAC processing for the system with a high rate and a high data throughput.
  • MAC layer units and PHY units are essential for the realization of the mid-short distance wireless communication system with a high data throughput.
  • the following mainly describes the design of a MAC layer unit applicable to the mid-short distance high-speed wireless communication system.
  • Table 1 Name of channel Function Short preamble sequence Coarse synchronizing of system S-Preamble Long preamble sequence Fine synchronizing of system and channel estimation L-Preamble System information channel 1.
  • Configuration of broadcast frame structure SICH Transmission control channel 1. scheduling of uplink transmission channel resources CH 2. scheduling of downlink transmission channel resources Downlink sounding channel 1. Downlink channel measurement DL-SCH Uplink sounding channel 1. Uplink channel measurement UL-SCH Uplink scheduling request channel 1. Uplink scheduling request UL-SRCH Uplink random access channel 1.
  • the access system of the mid-short distance wireless communication system is composed of a CAP and STAs, and the STA includes the existing various data equipment, such as PDA, notebook, camera, video camera.
  • a STA1 and a STA2 access to the CAP through an air interface protocol
  • the CAP establishes communication with an external network (such as an IP backbone network and an Ethernet) through a wire or wireless manner.
  • the protocol of the CAP includes an air interface layer, including a MAC layer and a PHY layer.
  • the protocol of the STA includes an application layer (Application), a transmission control protocol (TCP) layer, an Internet Protocol (IP) layer, a MAC layer and a PHY layer.
  • Figure 4 gives the process of sending and receiving protocol data between the STA and the CAP.
  • the STA processes and packages the application data (such as VoIP, video, etc.) through the application layer and TCP/IP layer, and sends the formed IP packet to the IP adaptation layer, where the IP packet is transformed, mapped, and sent to the MAC layer, and then the MAC layer mapped IP packet undergoes operations such as fragment, encryption, framing and aggregation and sent to the PHY layer, and finally mapped by the PHY layer onto the wireless channel for data transmission.
  • the application data such as VoIP, video, etc.
  • the MAC layer is used to manage and control the distribution and sharing of transmission resources on the physical layer among multiple users.
  • the MAC layer defined herein has the following characteristics:
  • the structural diagram of the function of the MAC sub-layer unit of the mid-short distance wireless communication system is shown in Figure 5 :
  • the MAC layer includes an adaptation sub-layer and a MAC sub-layer.
  • the adaptation sub-layer uses the service provided by the MAC sub-layer.
  • the adaptation sub-layer completes the following functions of:
  • the basic functions of the MAC sub-layer are categorized into a management control plane and a data plane.
  • the management control plane includes the following functions of:
  • the data plane includes the following functions of:
  • the present invention specifically designs a type of MAC Protocol Data Unit (MPDU) applicable to the high-speed data transmission network with a high capacity, and the functions of each module in the system are implemented through interactions between MPDUs for different functions, thus realizing the functions of the mid-short distance wireless communication system.
  • MPDU MAC Protocol Data Unit
  • SDU Service Data Unit
  • PDU Protocol Data Unit
  • the MPDU is applicable to wireless communication between communication peers, namely, a transmitting terminal and a receiving terminal.
  • the transmitting terminal is for example the CAP or STA in the present invention; and the receiving terminal is also for example the CAP or STA in the present invention.
  • Both communication peers negotiate the frame format of MPDU in advance, and during each communication, the transmitting terminal assigns value to each field of the pre-negotiated MPDU to obtain an MPDU for sending, and the receiving terminal parses the received MPDU, so that the communication between both peers is implemented.
  • the MPDU designed in the present invention provides a frame structure for high-speed data transmission with a high capacity.
  • Figure 6 shows the frame format for encapsulation of MPDU at the MAC layer.
  • each MPDU may be divided into three parts, i.e., a first part which is the common MAC frame header of a fixed length; a second part which is the frame body used to carry the payload carried by the MPDU; and a third part which is the Frame Check Sequence (FCS) information.
  • FCS Frame Check Sequence
  • the bits contained in all the fields in the MAC frame are numbered in an order from low to high, and sent to the physical layer in the same order from low to high.
  • the bits in one byte are sent to the physical layer in the sequence from left (LSB) to right (MSB).
  • the MAC frame header refers to the part in the MPDU other than the frame body and FCS.
  • the second part i.e. the frame body
  • the frame body is used to carry the payload carried by the MPDU, namely, data or management message contents need to be delivered.
  • the payload includes one or more MSDUs, or one MMPDU, or one MSDU fragment, or one MMPDU fragment.
  • the mid-short distance wireless communication system allows for a payload of a fixed length or a variable length, therefore, the length of the entire MPDU can be fixed or variable.
  • the length of the frame body field is variable, the minimum length of the frame body is 0 byte, and the maximum length of the frame body is 4095 bytes.
  • the MAC layer of the mid-short distance wireless communication system can process any type of upper layer service, without the knowledge of the specific format or bit coding mode of the carried message.
  • the payload in the MPDU in the mid-short distance wireless communication system is optional.
  • the occurrence of a MAC frame header not accompanied by a frame body is allowed, as shown in Figure 7 , that is, only the MAC frame header and the FCS are included, or even only the MAC frame header is included as shown in Figure 8 .
  • FCS field is used for frame check.
  • the FCS field is a field of 32 bits, including a 32-bit CRC.
  • the FCS is calculated from all the fields of the MAC frame header and the frame body.
  • the initial state of the register is 0xFFFFFFFF; after completion of operations, the state of the register is subjected to a logical NOT operation and outputted as the FCS field.
  • the FCS field is sent out a byte sequence from a high order to a low order.
  • the second embodiment of the present invention provides a wireless communication method, as shown in Figure 9 , and the method includes S101-S104 below.
  • the type of a MAC frame header is determined according to the type of an MPDU.
  • the type of the MPDU is determined according to the contents to be sent.
  • the contents to be sent include an upper-layer protocol data unit or MAC layer management message.
  • Step S102 value is assigned to function fields in the MAC frame header to generate the MAC frame header.
  • the type of the MPDU indicates two types of frames having different MAC frame header lengths.
  • the length L1 of a MAC frame header of a first one of the two types of frames and the length L2 of a MAC frame header of a second one of the two types of frames are fixed, and the length L1 is smaller than the length L2.
  • the MAC frame header of the first type of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information and a field carrying flow identification information.
  • the protocol version information is used to indicate the current standard protocol version.
  • the frame type information and the sub-type information are used to indicate the function type of the frame.
  • the flow identification information is used to indicate the specific uplink or downlink service flow to which the current frame pertains.
  • the MAC frame header of the firs type of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information and a field carrying repeat indication information.
  • the repeat indication information is used to indicate that the current frame is a retransmission of the previous frame.
  • the MAC frame header of the second type of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information.
  • the fragment number information is used to indicate the sequence number of each fragment in a MAC service data unit (MSDU) or a MAC management protocol data unit (MMPDU).
  • MSDU MAC service data unit
  • MMPDU MAC management protocol data unit
  • the sequence number information is used to indicate the sequence number of the MAC service data unit (MSDU) or the MAC management protocol data unit (MMPDU).
  • MSDU MAC service data unit
  • MMPDU MAC management protocol data unit
  • the fragment indication information indicates if any subsequent fragment of the current MAC service data unit (MSDU) or MAC management protocol data unit (MMPDU) exists.
  • MSDU MAC service data unit
  • MMPDU MAC management protocol data unit
  • the length information is used to indicate the total bytes of all the fields between the MAC frame header field and the FCS field.
  • the MAC frame header of the second type of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information, a field carrying repeat indication information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information.
  • the frame type information and the sub-type information may be carried in the same field or different fields.
  • Step S103 the MPDU including at least the MAC frame header is generated.
  • Step S104 the MPDU is encapsulated and sent out.
  • Step S102 also includes: determine CRC information of the MPDU according to the MAC frame header, and obtaining the frame check sequence (FCS), where the MPDU generated at Step S103 at least includes the MAC frame header and the FCS.
  • FCS frame check sequence
  • Some embodiments also provide a wireless communication method, including Steps S201-S203 below.
  • Step S201 determine the type of the MAC frame header according to the type of the MPDU.
  • the type of the MPDU is determined according to the contents to be sent.
  • Step S202 assigning values to function fields in the MAC frame header to generate the MAC frame header
  • a payload is filled in the frame body of the MPDU according to the contents to be sent.
  • composition of the MAC frame header is the same with that as described in the first embodiment, and thus will not be further described here.
  • the payload includes one or more MAC service data units (MSDUs), or one management protocol data unit (MMPDU), or one MSDU fragment, or one MMPDU fragment.
  • MSDUs MAC service data units
  • MMPDU management protocol data unit
  • Step S203 generating the MPDU including at least the MAC frame header and the frame body.
  • Step S202 also includes: determining the CRC information of the MPDU according to the MAC frame header and the frame body, and obtaining FCS; where the MPDU generated in Step S203 at least includes the MAC frame header and the FCS.
  • the third embodiment of the present invention provides a wireless communication method, as shown in Figure 10 , including Steps S301-S302.
  • Step S301 receiving the MAC protocol data unit (MPDU) which at least includes the MAC frame header.
  • MPDU MAC protocol data unit
  • the MPDU at least includes the MAC frame header and the frame body.
  • Step S302 parsing the MPDU according to the MAC frame header, and determining the type of the MPDU.
  • the type of the MPDU indicates two types of frames having different MAC frame header lengths.
  • the Length L1 of a MAC frame header of a first one of the two types of frames and the Length L2 of a MAC frame header of a second one of the two types of frames are fixed, and the length L1 is smaller than the length L2.
  • the MAC frame header of the first type of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information and a field carrying flow identification information.
  • the protocol version information is used to indicate the current standard protocol version.
  • the frame type information and the sub-type information are used to indicate the function type of the frame.
  • the flow identification information is used to indicate an uplink or downlink service flow.
  • the MAC frame header of the first type of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information and a field carrying repeat indication information.
  • the repeat indication information is used to indicate that the current frame is a retransmission of the previous frame.
  • the MAC frame header of the second type of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information.
  • the fragment number information is used to indicate the sequence number of each fragment in the MAC service data unit (MSDU) or the MAC management protocol data unit (MMPDU).
  • MSDU MAC service data unit
  • MMPDU MAC management protocol data unit
  • the sequence number information is used to indicate the sequence number of the MSDU or the MMPDU.
  • the fragment indication information indicates if any subsequent fragment of the current MSDU or MMPDU exists.
  • the length information is used to indicate the total bytes of all the fields between the MAC frame header field and the FCS field.
  • the MAC frame header of the second type of frame is composed of a field carrying frame type information, a field carrying sub-type information, a field carrying protocol version information, a field carrying flow identification information, a field carrying repeat indication information, a field carrying fragment number information, a field carrying sequence number information, a field carrying fragment indication information and a field carrying length information.
  • the frame type information and the sub-type information may be carried in the same field or different fields.
  • Step S302 also includes parsing the MAC frame body to extract the payload from the frame body.
  • the payload includes one or more MSDUs, or one MMPDU, or one MSDU fragment, or one MMPDU fragment.
  • the MPDU further carries an FCS
  • a step of positioning the FCS according to the length information and carrying out CRC check on the MAC frame header and the frame body according to the FCS is further included.
  • the length information is the length information carried in the MPDU or the preset length information in the system.
  • the length information is the length information carried in the MPDU; and for the management control frame without sequence number, the length information is the preset length information in the system.
  • the fourth embodiment of the present invention provides a common MAC frame of a fixed length, as shown in Figure 11 , including a MAC frame header, a frame body and an FCS field.
  • the MAC frame header at least includes a frame control field used to indicate the control information of the current MPDU.
  • Each MAC frame header in the embodiment of the present invention may include the frame control field.
  • the frame control field is specifically composed of the following fields: a protocol version field, a frame type field, a sub-type field and a flow identification field.
  • the protocol version field is used to indicate the current standard protocol version, to enable the receiving terminal to communicate with the transmitting terminal according to the corresponding MAC protocol.
  • the length of the protocol version field is 2 bits.
  • the frame type field is used to identify the function type of the frame, to enable the receiving terminal to identify the corresponding frame.
  • management control frames There are two types of frames, i.e. management control frames and data frames.
  • the length of the frame type field is 1 bit.
  • the length of the sub-type field is 5 bits.
  • This sub-type field is used to identify the function type of the frame together with the frame type field.
  • Table 2 presents various effective combinations of the type and the sub-type as follows: Table 2 Type b2 Type description Value of sub-type b7 b6 b5 b4 b3 Description of sub-type 0 Management Control 00000 Broadcast information frame (BCF) 00001 Random access request frame (RA_REQ) 00010 Random access response frame (RA_RSP) 00011 Terminal basic capacity negotiation request frame (SBC_REQ) 00100 Terminal basic capacity negotiation response frame (SBC_RSP) 00101 Dynamic service Addition request frame (DSA_REQ) 00110 Dynamic service Addition response frame (DSA_RSP) 00111 Dynamic service Change request frame (DSC_REQ) 01000 Dynamic service Change response frame (DSC_RSP) 01001 Dynamic service deletion request frame (DSD_REQ) 01010 Dynamic service deletion response frame (DSD_RSP) 01011 Independent resource request frame (RES_REQ) 01100 Multi-input multi-output feedback
  • Management control frames include management control frames with a sequence number and management control frames without sequence number.
  • the management control frames with a sequence number include a broadcast information frame, a multi-input multi-output feedback frame based on channel state information, a feedback frame based on beamforming matrix and a channel quality feedback frame.
  • the management control frames without sequence number include a random access request frame, a random access response frame, a terminal basic capacity negotiation request frame, a terminal basic capacity negotiation response frame, a dynamic service establishment request frame, a dynamic service establishment response frame, a dynamic service correction request frame, a dynamic service correction response frame, a dynamic service deletion request frame, a dynamic service deletion response frame, an independent resource request frame, an acknowledge frame, a group acknowledge request frame, a group acknowledge frame, a network quitting frame, a channel switch informing frame, a sleep request frame, sleep response frame and a downlink service indication frame.
  • the management control frame without sequence number has a frame format as shown in Figure 11 , and includes a MAC frame header, a frame body and an FCS, and the MAC frame header includes a frame control field.
  • the management control frame with a sequence number has a frame format as shown in Figure 13 , and at least includes a MAC frame header and an FCS, and preferably further includes a frame body.
  • the MAC frame header includes a frame control field, a fragment number field, a sequence number field, a reserved field, a fragment indication field and a length field.
  • the receiving terminal can determine whether the MPDU is a management control frame or a data frame, and the sub-type of the MPDU.
  • the flow identification field is used to identify the uplink or downlink service flow to which the current frame pertains, to enable the receiving terminal to identify the service flow to which the MPDU pertains.
  • the length of the flow identification field is 4 bits, particularly, a value of 0000 of these 4 bits is used for the management control frame, and values of 0001-1111 of these bits are used for the data frame.
  • the length of the reserved field is 4 bits.
  • the frame body may be included or not. If the frame body has a fixed length, the length of the frame body is preset in the system.
  • the FCS field may be included or not.
  • Figure 13 shows the FCS of 4 bytes for example.
  • the fifth embodiment provides a MAC frame header, which includes a frame control field.
  • the frame control field is composed of a protocol type, a frame type, a sub-type, a flow identification and a repeat indication.
  • the repeat indication field is used to indicate whether the current frame is a retransmission of the previous frame, to enable the receiving terminal to distinguish the new frame from the repeated frame.
  • the length of the repeat indication field is 1 bit. If the current frame is the repeat version of the previous frame, the repeat indication field is set as 1; otherwise, the repeat indication field is set as 0.
  • the sixth embodiment of the present invention provides another type of MAC frame.
  • the MAC frame header is composed of a frame control field, a fragment number field, a sequence number field, a fragment indication field and a length field.
  • the fragment number field has a length of 4 bits (with a value of 0-5) and is used to indicate the number of each fragment of the MSDU or MMPDU. When the MSDU/MMPDU contains only one fragment, the fragment number is 0; when MSDU/MMPDU contains multiple fragments, the first fragment number is 0. The fragment numbers of fragments in the same MSDU or MMPDU are incremented by 1.
  • the sequence number field has a length of 12 bits with a value of 0-4095, and is used to indicate the sequence number of the MSDU MMPDU.
  • Each MSDU or MMPDU sent in a FID flow is assigned with one sequence number.
  • the sequence number of the first MSDU or MMPDU is 0, and the sequence numbers of the MSDU or MMPDU within the same FID flow are incremented by 1.
  • the reserved field has a length of 3 bits and is set as 0 by default.
  • the length of the fragment indication field is 1 bit. In all the data frames or management control frames with a sequence number, if any subsequent fragment of the current MSDU or MMPDU follows, the fragment indication field is set as 1; otherwise, the fragment indication field is set as 0.
  • the receiving terminal is enabled to determine whether to carry out the operation of fragment reassembly.
  • the length field contains 12 bits, and indicates the total bytes of all the fields between the MAC header field and the FCS field, to enable the receiving terminal to find out the complete MPDU.
  • the frame body may be included or not, and the frame body includes 0-4095 bytes; when the frame body is 0, it indicates that there is no frame body.
  • the length of the frame body is indicated by the length field in the MAC frame header.
  • the FCS field may be included or not, and Figure 13 shows the FCS field of 4 bytes for example.
  • the seventh embodiment of the present invention provides a transmitting device, as shown in Figure 15 , including:
  • the determination module 11 is also used to determine the type of the MPDU according to the contents to be sent.
  • the second generation module 13 is also used to fill the frame body of the MPDU with a payload according to the contents to be sent; the MPDU generated in Step S203 at least includes the MAC frame header and the frame body.
  • the payload includes one or more MSDUs, or one MMPDU, or one MSDU fragment, or one MMPDU fragment.
  • the second generation module 13 is also used to determine CRC information of the MPDU according to the MAC frame header and the frame body and obtain an FCS.
  • the MPDU generated in Step S203 at least includes the MAC frame header and the FCS.
  • the transmitting device provided in the seventh embodiment of the present invention operates with principles and the related operating flow nearly the same as those described in the embodiments 1-6 of the wireless communication method, and additional introduction will not be provided herein.
  • the eighth embodiment of the present invention provides a receiving device, as shown in Figure 16 , including:
  • the parsing module 22 is also used to parse the frame body and extract the payload from the frame body, and the payload includes one or more MSDUs, or one MMPDU, or one MSDU fragment, or one MMPDU fragment.
  • the receiving device provided in the eighth embodiment of the present invention operates with principles and the related operating flow nearly the same as those described in the embodiments 1-6 of the wireless communication method, and additional introduction will not be provided herein.
  • the ninth embodiment of the present invention provides a wireless communication system, including: a transmitting device provided in the seventh embodiment and a receiving device provided in the eighth embodiment.
  • the wireless communication system provided in the ninth embodiment of the present invention operates with principles and the related operating flow nearly the same as those described in the embodiments 1-6 of the preceding wireless communication method, transmitting device and receiving device, and additional introductions will not be provided herein.

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US9240974B2 (en) 2016-01-19
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